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extra exam 3

# extra exam 3 - Answer no it will not be valid 2 A power...

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Q out Q Q in Engine #1 Engine #2 W 1 W 2 1. (30 pts) Two real engines are operating as a cycle in series as shown below. Engine #1 takes in 1200 W of heat rejects 750 W of heat to Engine #2 at 300 ° C. Engine #2 operates at an efficiency equal to 60% of the Carnot efficiency and has an outlet temperature of 27 ° C. a) For Engine #2, determine the efficiency and the amount of work produced. (15 pts) Answer: W 2 = -217.5J/s; b) If an engineer wants to increase the inlet temperature of Engine #1 to 550 ° C, will the cyclic process still be valid? (15 pts)

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Unformatted text preview: Answer: no, it will not be valid 2. A power plant uses a simple ideal Rankine cycle with steam as the working fluid to produce a net work of 2.1 MW per cycle . Steam enters the turbine at 10 MPa and 500 ° C and is cooled in the condenser at a pressure of 1400 kPa. The energy input to the pump is 23.6 kJ/kg of steam and the condenser produces saturated liquid water. (30 pts) Determine the mass flow rate of the steam and the thermal efficiency for this cycle. Answer:...
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extra exam 3 - Answer no it will not be valid 2 A power...

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